/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
export function csCumsum(ptr, c, n) {
  // variables
  var i;
  var nz = 0;

  for (i = 0; i < n; i++) {
    // initialize ptr @ i
    ptr[i] = nz; // increment number of nonzeros

    nz += c[i]; // also copy p[0..n-1] back into c[0..n-1]

    c[i] = ptr[i];
  } // finalize ptr


  ptr[n] = nz; // return sum (c [0..n-1])

  return nz;
}